Why not E?

While we do have the views of two different disciplines, the author isn't just comparing them. The author is clearly arguing in favor of one over the other, and explicitly tells us in the first line of paragraph 3 that the comma specialists should use the methods of sociology. For primary purpose questions we need to make sure that the right answer reflects why the author wrote the passage. While e may describe the passages structure in overly general terms, it fails to capture that the author picked a side and was not some neutral voice.